0906-E
7
WIRING CONNECTIONS AND COMMUNICATIONS
COMMUNICATION
MASTER/SLAVE
Function
Link several units in order to allow a “Master/Slave” relationship in between each units
Description
Three modes are available and can be set up using following set points:
3922 ! number of units linked (maximum 4 for Ecologic range, 2 for Ecomax)
3923 ! Operation mode:
• Back-up mode
One unit is the back-up unit and will operate if any of the other units has a failure.
• Rolling Back-up mode
Same as above, except the "back-up" unit will change every Tuesday at 2 am.
• Cascade mode
No back-up unit. During start-up, the units’ capacity steps are started in cascade unit by unit.
In every case, the outlet water temperature (set point 3924) and/or the outside air temperature (set point 3925) used for
regulation can be set by using following calculations:
• Not used ! Each unit regulates with its own sensors
• M/S Temp ! Slaves units regulate with Master sensors
• M/S Aver ! Every units regulate with the global sensors average value
In every mode, for the management of safety, each unit remains independents.
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